The 305/60R18 Cooper Discoverer STT PRO has a diameter of 32.68", a width of 12", mounts on a 18" rim and has 636 revolutions per mile. It weighs 65 lbs, has a max load of 3195 lbs, a maximum air pressure of 65 psi, a tread depth of 21/32" and should be used on a rim width of 8.5-11".